Yoyi DHG-9038A High-Temperature Forced-Air Drying Oven (400 °C)

Overview

The Yoyi DHG-9038A is a precision-engineered high-temperature forced-air drying oven designed for laboratory and industrial thermal processing applications requiring stable, uniform heating up to 400 °C. Built upon the principles of convective heat transfer and active air circulation, this oven utilizes a multi-blade centrifugal fan and optimized airflow ducting to ensure rapid thermal equilibration and minimal spatial temperature deviation across the working chamber. Its robust construction—featuring double-layer ceramic fiber door gaskets, glass-fiber insulation between chamber and outer casing, and a mirror-polished stainless steel interior—enables sustained operation at elevated temperatures while minimizing thermal loss and maintaining long-term dimensional stability. The unit complies with fundamental safety and performance expectations for Class II laboratory ovens under IEC 61010-1 and meets structural requirements aligned with ISO/IEC 17025 environmental conditioning provisions.

Key Features

• Microprocessor-based temperature controller with 4.3-inch LCD interface supporting setpoint programming, real-time monitoring, timer function (1–9999 minutes), and auto-tuning PID algorithm for precise thermal regulation
• Pre-heating chamber design directs pre-mixed heated air directly into the work area, reducing warm-up time and improving thermal homogeneity
• Double-sealed door with dual-ceramic fiber gasket ensures integrity at continuous 400 °C operation and extends sealing service life under thermal cycling
• Cold-rolled steel exterior with electrostatic epoxy powder coating provides corrosion resistance and mechanical durability in shared lab environments
• Independent over-temperature cut-off system (optional) interrupts power when preset safety limit is exceeded—critical for unattended operation and GLP-compliant workflows
• Adjustable stainless steel shelving with clip-lock mechanism allows flexible sample arrangement without tools; load capacity per shelf: ≤15 kg

Sample Compatibility & Compliance

The DHG-9038A accommodates a broad range of non-volatile, thermally stable samples including metal alloys, ceramic precursors, polymer pellets, catalyst supports, and inert reference materials. It is not intended for flammable solvents, volatile organic compounds, or biological specimens requiring containment. Chamber geometry (300×300×350 mm) supports standard ISO 8573-1 test coupons, ASTM E145 specimen trays, and custom fixtures up to 280 mm in height. All electrical components meet IP20 ingress protection standards. Optional RS485 interface enables integration into centralized facility monitoring systems compliant with FDA 21 CFR Part 11 data integrity requirements when paired with validated software platforms.

Software & Data Management

While the base configuration operates via standalone microcontroller logic, optional connectivity modules extend functionality: an RS485 port (with Modbus RTU protocol support) permits bidirectional communication with SCADA or LIMS systems for audit-trail-capable temperature logging. An embedded thermal printer (optional) produces time-stamped hardcopy records meeting ISO/IEC 17025 clause 7.7 documentation mandates. Firmware includes non-volatile memory for parameter retention during power interruption—preserving setpoints, timers, and calibration offsets without manual re-entry. All digital outputs are timestamped to millisecond resolution and traceable to internal RTC synchronized at boot.

Applications

• Pre-drying of moisture-sensitive raw materials prior to XRD or TGA analysis
• Curing of epoxy-coated substrates and printed circuit board laminates
• Thermal aging studies per ASTM D573 and ISO 188 protocols
• Residue ashing preparation for gravimetric analysis (e.g., ASTM D874)
• Conditioning of humidity sensors and hygrometers per ISO 8573-3
• Stabilization annealing of sintered metal parts before dimensional inspection

FAQ

What is the maximum continuous operating temperature?
The DHG-9038A is rated for continuous operation at 400 °C, verified per manufacturer thermal mapping reports conducted at 100 °C, 250 °C, and 400 °C under no-load conditions.
Does the oven support programmable ramp-soak profiles?
No—the standard controller supports single-setpoint operation with timer hold functionality. A programmable temperature controller (optional add-on, part #PC-DHG-PRO) enables up to 30 segment ramp/soak sequences.
Is validation documentation available for IQ/OQ/PQ protocols?
Yes—Yoyi provides factory-as-tested calibration certificates (NIST-traceable thermocouple verification at three points), as well as customizable IQ/OQ templates compatible with GMP and GLP quality systems.
Can the chamber be purged with inert gas?
The unit does not include built-in gas inlet/outlet ports; however, 25 mm and 50 mm diameter test port kits (optional) allow external nitrogen or argon purging when configured with appropriate flow regulators and pressure relief.
What maintenance intervals are recommended?
Fan bearing lubrication every 12 months, gasket visual inspection every 6 months, and full thermocouple recalibration annually—or after any impact event affecting door alignment or chamber integrity.